I do not know their logic but this is what moving2canada published after last draw
Source:
https://www.google.ca/amp/s/moving2canada.com/express-entry-draw/amp/
Will Express Entry candidates with CRS scores below 450-470 be invited in the future?
There is every possibility that future Express Entry draws will result in candidates with scores below 450 points being invited to apply. As recently as January of this year, candidates with scores in the 430s were being invited, and IRCC has set an ambitious target to admit more economic immigrants through Express Entry programs in 2019 and over the next two years.
On October 31, 2018, the government of Canada revealed its updated
Canada Immigration Levels Plan for 2019-2021. It outlined Canada’s commitment to increase the numbers accepted through the
Federal Skilled Worker Class,
Canadian Experience Class, and
Federal Skilled Trades Class to around 256,000 over the next three years, with another 200,000 or so new permanent residents to settle through the
Provincial Nominee Programs (PNPs) before the end of 2021.